CN103901296B - The detection method of single two-phase isolated island and/or three-phase island effect - Google Patents
The detection method of single two-phase isolated island and/or three-phase island effect Download PDFInfo
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- CN103901296B CN103901296B CN201410060231.1A CN201410060231A CN103901296B CN 103901296 B CN103901296 B CN 103901296B CN 201410060231 A CN201410060231 A CN 201410060231A CN 103901296 B CN103901296 B CN 103901296B
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Abstract
The present invention relates to a kind of single two-phase isolated island and/or the detection method of three-phase island effect, to the given disturbance of distributed power source electricity generation system, judge whether single two-phase isolated island decision content and/or three-phase isolated island decision content exceed respective threshold value, when more than when enter positive feedback pattern；Under positive feedback pattern, using the feedback quantity of the feedback quantity and/or three-phase isolated island decision content or the formation of its correlative of single two-phase isolated island decision content or the formation of its correlative as the amount of positive feedback for disturbing, so as to judge whether single two-phase isolated island and/or three-phase island effect by positive feedback mechanism；Single two-phase isolated island decision content is that the negative sequence component produced during single two-phase isolated island occurs.This method judges single two-phase isolated island and three-phase island effect using negative sequence component combination positive feedback mechanism, solve the problems, such as that existing island detection method is present unstable and inaccurate, any isolated island situation is can be determined that, and the adverse effect that reactive disturbance is caused to power network can be reduced.
Description
Technical field
The present invention relates to one kind for detecting whether distributed power source electricity generation system occurs single two-phase isolated island and/or three-phase is lonely
The method of island effect.
Background technology
The distributed power source being incorporated into the power networks when bulk power grid breaks down, fail to detect power down mode in time and
Itself can not will cut off utility grid network rapidly, and for being formed from distributed power source electricity generation system to load supplying around
A kind of self-energizing phenomenon, referred to as island effect.Island effect will cause unfavorable to whole power distribution system equipment and user terminal
Influence, including：Endanger the life security of power equipment maintaining personnel；Protection switch operation program in influence distribution system；Isolated island
The supply voltage and the instability quality of frequency that region occurs can bring destruction etc. to electrical equipment.Therefore as safe and reliable
Grid-connected distributed power generation unit, it is necessary to can in time detect island effect and avoid brought harm.
Existing island detection method is broadly divided into passive detection and active detecting, and active detecting side is used mostly at present
Method.Active detecting method mainly has electric network impedance measurement, phase hit, frequency disturbance, active disturbance and reactive disturbance.Wherein
Phase hit is easily judged by accident, and electric network impedance is difficult to realize, active disturbance can then cause the unstable of power network, therefore main application frequency
Rate is disturbed and reactive disturbance method.
The principle of frequency disturbance method is not changed under normal circumstances based on mains frequency.System is given deposits with actual electric network
In the frequency instruction of certain deviation, the frequency of grid-connected current is not caused to change in the case of non-isolated island, and in the case of isolated island,
Inverter output frequency then changes, while detecting island phenomenon by positive feedback mechanism.
Reactive disturbance method is similar to frequency disturbance mechanism, and reactive disturbance is exported so as to cause inversion by the case of isolated island
The change of device output frequency, while detecting island phenomenon by positive feedback mechanism.
In the case of single two-phase isolated island, above-mentioned most methods failure is now general to detect three-phase using reactive disturbance
The phase method of voltage, while detecting island phenomenon by positive feedback mechanism.
In the case of single two-phase isolated island, detect the phase method of three-phase voltage, it is necessary to use zero passage according to reactive disturbance
Point methods detect the phase of three-phase voltage, and in a practical situation, power network has certain fluctuation, easily cause zero crossing inspection
The phase angle measured is inaccurate, and the phase angle for detecting is unstable, so as to be influenceed on isolated island detection band.Meanwhile, using
During unidirectional reactive disturbance method, if reactive disturbance is smaller, detection value changes are not clear aobvious, are difficult detection；If increasing reactive disturbance
Amount, then can cause certain adverse effect to power network.
The content of the invention
It is an object of the invention to provide it is a kind of avoid that existing island detection method is present it is inaccurate, unstable the problems such as,
The detection method of island effect can accurately be judged.
To reach above-mentioned purpose, the technical solution adopted by the present invention is：
The detection method of a kind of single two-phase isolated island and/or three-phase island effect, for detecting and dividing that power network is incorporated into the power networks
Whether cloth power supply electricity generation system there is single two-phase isolated island and/or three-phase island effect, and the method is：To described distributed electrical
The given disturbance I of source electricity generation systemq, judge whether single two-phase isolated island decision content and/or three-phase isolated island decision content exceed respective
Threshold value, positive feedback pattern is entered when single two-phase isolated island decision content and/or three-phase isolated island decision content exceed respective threshold value；
Under described positive feedback pattern, feedback quantity that described single two-phase isolated island decision content or its correlative are formed and/or described
The feedback quantity that three-phase isolated island decision content or its correlative are formed is used as described disturbance IqAmount of positive feedback so that pass through positive feedback
Mechanism judges whether single two-phase isolated island and/or three-phase island effect；Described single two-phase isolated island decision content is generation single two
The negative sequence component V produced during phase isolated islandn。
Described disturbance IqCommon version be Iq=I0±I1±I2±I3, wherein, I0For described distributed power source generates electricity
Idle instruction needed for each function of system, I1It is reactive disturbance amount, I2It is described single two-phase isolated island decision content or its correlative
The feedback quantity of formation, I3For the feedback quantity that described three-phase isolated island decision content or its correlative are formed；
Described disturbance IqCycle be T, and the feedback quantity that described single two-phase isolated island decision content or its correlative are formed
The feedback quantity formed with described three-phase isolated island decision content or its correlative is simultaneously negative direction for positive direction or simultaneously；
During non-described positive feedback pattern, described disturbance IqFor
Wherein t is the time；
And under described positive feedback pattern, described disturbance IqFor
Wherein Iq0It is into disturbance I during described positive feedback patternq, whenWhen into described positive feedback mould
Formula, then Iq0=I0+I1, whenWhen into described positive feedback pattern, then Iq0=I0-I1。
The feedback quantity I that described single two-phase isolated island decision content or its correlative are formed2It is I2=k1× a, wherein, k1It is ratio
Coefficient, a is described single two-phase isolated island decision content or its correlative；
The correlative of the described negative sequence component for occurring to be produced during single two-phase isolated island includes
ΔI=k×VnOr Δ Iq=k×ΔVnOr Δ Iq=k×|ΔVn|, wherein, k is proportionality coefficient, Δ VnFor described is born
Order components VnWith described disturbance IqVariable quantity.
Described three-phase isolated island decision content is frequency, the feedback quantity that described three-phase isolated island decision content or its correlative are formed
I3It is I2=k2× b, wherein, k2It is proportionality coefficient, b is described three-phase isolated island decision content or its correlative.
Because above-mentioned technical proposal is used, the present invention has following advantages compared with prior art：This method utilizes negative phase-sequence
Component combination positive feedback mechanism judges single two-phase isolated island and three-phase island effect, solves what existing island detection method was present
Unstable and inaccurate problem, it is possible to determine that any isolated island situation, and can reduce that reactive disturbance causes to power network it is unfavorable
Influence.
Brief description of the drawings
Accompanying drawing 1 is change schematic diagram of the negative sequence component with reactive disturbance.
Disturbance schematic diagram when accompanying drawing 2 is for non-described positive feedback pattern.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and examples.
Embodiment one：Detection method of the invention is based on three in the distributed power source electricity generation system being incorporated into the power networks with power network
Under the control system of phase inverter, as shown in Figure 1, three-phase inverter output is mutually 120 ° and amplitude identical balanced balanced current
Ia, Ib, Ic.Under normal circumstances, three-phase voltage is Ua, Ub, Uc, it is assumed that there is isolated island in A phases, then after isolated island, A phase voltage vectors Ua
As reactive disturbance shifts, so as to produce negative sequence voltage Vn, and electrical network negative phase-sequence component VnWill be with disturbance IqChange and become
Change, i.e., as a given IqAfter disturbance, Ua' occur to be shifted with disturbance, now produce negative sequence component Vn', work as IqDisturbance after
It is continuous when changing, Ua' continue to shift, will now produce new negative sequence component Vn″.That is, lonely when there is single two-phase
During island, line voltage occurs imbalance under reactive disturbance, now can then produce negative sequence component.It is easy based on electrical network negative phase-sequence component
Detection and the characteristic of stabilization, it is lonely based on electrical network negative phase-sequence component detection list two-phase isolated island and detection three-phase we have proposed one kind
The method on island, while mitigating adverse effect of the reactive disturbance to power network using the scheme that positive negative sense is disturbed.
The detection method of a kind of single two-phase isolated island and/or three-phase island effect, for detecting and dividing that power network is incorporated into the power networks
Whether cloth power supply electricity generation system there is single two-phase isolated island and/or three-phase island effect.
The method is：To the given disturbance I of distributed power source electricity generation systemq, judge single two-phase isolated island decision content and/or
Whether three-phase isolated island decision content exceedes respective threshold value.Now, generation when single two-phase isolated island decision content is for generation list two-phase isolated island
Negative sequence component Vn, and three-phase isolated island decision content is frequency.
Enter positive feedback pattern when single two-phase isolated island decision content and/or three-phase isolated island decision content exceed respective threshold value.
Under positive feedback pattern, feedback quantity and/or three-phase isolated island decision content that single two-phase isolated island decision content or its correlative are formed or
The feedback quantity that its correlative is formed is used as disturbance IqAmount of positive feedback, so as to judge whether single two-phase by positive feedback mechanism
Isolated island and/or three-phase island effect.
Specifically, disturbance IqCommon version be Iq=I0±I1±I2±I3, wherein, I0It is distributed power source electricity generation system
Each function needed for idle instruction, I1It is reactive disturbance amount, I2For the feedback that single two-phase isolated island decision content or its correlative are formed
Amount, I3For the feedback quantity that three-phase isolated island decision content or its correlative are formed.
Disturbance IqCycle be T, and the feedback quantity that is formed of single two-phase isolated island decision content or its correlative and three-phase isolated island are sentenced
The feedback quantity that quantitative or its correlative is formed is simultaneously negative direction for positive direction or simultaneously.Single two-phase isolated island decision content or its correlation
Measure the feedback quantity I for being formed2It is I2=k1× a, wherein, k1It is proportionality coefficient, a is single two-phase isolated island decision content or its correlative, i.e. a
It is negative sequence component VnOr its correlative.Negative sequence component VnCorrelative include Δ I=k × VnOr Δ Iq=k×ΔVnOr Δ Iq=k
×|ΔVn|, wherein, k is proportionality coefficient, Δ VnIt is negative sequence component VnWith disturbance IqVariable quantity.Three-phase isolated island decision content or its
The feedback quantity I that correlative is formed3It is I2=k2× b, wherein, k2It is proportionality coefficient, b is three-phase isolated island decision content or its correlative,
That is b is frequency or its correlative.
During anon-normal feedback model, as shown in Figure 2, I is disturbedqFor
Wherein t is the time.
And under positive feedback pattern, disturb IqFor
Wherein Iq0It is into disturbance I during positive feedback patternq, whenWhen enter positive feedback pattern, then Iq0=I0+
I1, whenWhen enter positive feedback pattern, then Iq0=I0-I1。
Above-mentioned detection method utilizes electrical network negative phase-sequence component detection list two-phase isolated island, solves and is adopted in the case of single two-phase isolated island
With problem unstable and inaccurate present in the detection methods such as phase angle, while proposing, a kind of positive negative sense injection is idle to disturb
Dynamic method, single two-phase isolated island is judged to judge to be integrated with three-phase isolated island, so as to realize judging any isolated island situation, and is subtracted
The adverse effect that few reactive disturbance is caused to power network.Single two-phase isolated island decision content may be replaced by three-phase electricity phase in the above method
Potential difference.
The above embodiments merely illustrate the technical concept and features of the present invention, its object is to allow person skilled in the art
Scholar will appreciate that present disclosure and implement according to this that it is not intended to limit the scope of the present invention.It is all according to the present invention
The equivalent change or modification that Spirit Essence is made, should all be included within the scope of the present invention.
Claims (3)
1. the detection method of a kind of single two-phase isolated island and/or three-phase island effect, for detecting the distribution being incorporated into the power networks with power network
Whether formula power supply electricity generation system there is single two-phase isolated island and/or three-phase island effect, it is characterised in that：The method is：To described
The given disturbance I of distributed power source electricity generation systemq, judge that single two-phase isolated island decision content and/or three-phase isolated island decision content are
It is no more than respective threshold value, enter just when single two-phase isolated island decision content and/or three-phase isolated island decision content exceed respective threshold value
Feedback model；Under described positive feedback pattern, the feedback quantity that described single two-phase isolated island decision content or its correlative are formed
And/or the feedback quantity that described three-phase isolated island decision content or its correlative are formed is used as described disturbance IqAmount of positive feedback, from
And pass through positive feedback mechanism and judge whether single two-phase isolated island and/or three-phase island effect；Described single two-phase isolated island judges
Measure the negative sequence component V to occur to be produced during single two-phase isolated islandn, described three-phase isolated island decision content is frequency；
Described disturbance IqCommon version be Iq=I0±I1±I2±I3, wherein, I0It is described distributed power source electricity generation system
Each function needed for idle instruction, I1It is reactive disturbance amount, I2It is that described single two-phase isolated island decision content or its correlative are formed
Feedback quantity, I3For the feedback quantity that described three-phase isolated island decision content or its correlative are formed；
Described disturbance IqCycle be T, and the feedback quantity that is formed of described single two-phase isolated island decision content or its correlative and described
Three-phase isolated island decision content or its correlative formed feedback quantity simultaneously for positive direction or simultaneously be negative direction；
During non-described positive feedback pattern, described disturbance IqFor
Wherein t is the time；
And under described positive feedback pattern, described disturbance IqFor
Wherein Iq0It is into disturbance I during described positive feedback patternq, whenWhen into described positive feedback pattern, then Iq0
=I0+I1, whenWhen into described positive feedback pattern, then Iq0=I0-I1。
2. the detection method of single two-phase isolated island according to claim 1 and/or three-phase island effect, it is characterised in that：Institute
The feedback quantity I that the single two-phase isolated island decision content stated or its correlative are formed2It is I2=k1× a, wherein, k1It is proportionality coefficient, a is
Described single two-phase isolated island decision content or its correlative；
The correlative of the described negative sequence component for occurring to be produced during single two-phase isolated island includes
Δ I=k × VnOr Δ Iq=k × Δ VnOr Δ Iq=k × | Δ Vn|, wherein, k is proportionality coefficient, Δ VnFor described is born
Order components VnWith described disturbance IqVariable quantity.
3. the detection method of single two-phase isolated island according to claim 1 and/or three-phase island effect, it is characterised in that：Institute
The feedback quantity I that the three-phase isolated island decision content stated or its correlative are formed3It is I3=k2× b, wherein, k2It is proportionality coefficient, b is institute
The three-phase isolated island decision content or its correlative stated.
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